<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <div id="app">
        <com :child='msg'></com>
    </div>
    <template id="a">
        <button>{{child}}</button>
    </template>
    <script src="../vue.js"></script>
    <script>
        let btn={
            template:'#a',
            props: {
                child:{
                    type:String,
                    default:'he',
                }
            },
        }
        new Vue({
            el:'#app',
            data () {
                return {
                    msg:'hello',
                }
            },
            components: {
                com:btn,
            }
        })
    </script>
</body>
</html>